青藏高原是新生代以来印度板块向北推挤欧亚板块，引起地壳缩短、加厚、隆升的结果。青藏高原东北缘复杂的构造变形运动还造成大地震活动。初步证据显示，祁连地块、阿拉善南部、鄂尔多斯南部的岩石圈厚度明显不同，该地区的地壳和上地幔似乎有不同的变形特征。地震各向异性可以揭示壳幔深部介质的应力、形变和物质运动等特点。项目采用近场地壳剪切波分裂、远震多震相上地幔各向异性计算及接收函数的壳幔各向异性分析，结合噪声面波的各向异性反演，获得青藏高原东北缘深部各向异性图像，建立各向异性三维模型。项目采用地震体波和面波的各向异性分析技术，结合地表运动约束和构造信息，对青藏高原东北缘深部物质的形变与运动模式进行探索研究。

Tibet Plateau results from crust shortening, thickening and uplift following Cenozoic pushing northwards by Indian plate to Eurasian plate. Complex tectonic movement and deformation in the northeast front zone of Tibet Plateau result in occurrence of large earthquakes. Preliminary studies show lithospheric thickness is different under Qilian block, south Alax and south Ordos. The deformation seems different between the crust and the upper mantle in this zone. Seismic anisotropy can indicate the stress, deformation and motion in the crust and the mantle. The project plans to use near-field shear-wave splitting in the crust, teleseismic multi-phases calculation of anisotropy in the upper mantle, receiver functions anisotropy and anisotropic inversion by ambient noise surface wave. This project will obtain anisotropic image and build up a 3D anisotropic model in the northeast front zone of Tibet Plateau. Combining with anisotropic techniques of seismic body waves and surface waves, with surface motion and tectonic restraints, the project will detect deformation and motion style in the crust and the upper mantle in the northeast front zone of Tibet Plateau.